I mean 6-7 times to start in summer - 2000 Chevrolet Silverado 1500

Look on oil cap ;)

Check battery connection and battery.

I would like to know the fuel pressure reading, is this truck 6 or 8 cylinders?

loosen gas cap before starting. if it sucks air, check vent system. Gas shrinks when cooling down, and you are fighting vacuum to start. if not problem run by autozone have them check for codes

You got a PO302 &PO306 code

Welcome to ford diagnostics

The codes do not always coincide with the problem

I won't write a book here, let me know what started
the recent issue,what was done,and by whom

You I believe,the pros,not so much

Point I'm making,do you have a MIL Lamp on?
Do you have codes?
Has it gone into Fail-Safe
Have you made sure you have no vacuum leaks, if
someone other than yourself worked on it?
What is the problem,starting,driving,up hills,shift points,etc
give me all you got

P0496 2013 impala purge valve

your oil in winter is 15w40and summer 20w50

crank sensor likely-may be distributor sensor but my 98 sport was crank sensor situated in bell housing timed by flywheel

It is probably head gaskets - These need to be replaced.

if your caar is a v-6 or 6 cylinder motor you might have a injector shorting when hot this is very coming on those cars and very very hard to find from mechanics i'm a ase certified tecnichian and had found this as coming problem on this cars
you can ask to a mechanic to check the resistance on the injectors or when it happens again unplug one by one and see if car runs again if it does then replace all the injectors
because shops will keep trowing parts and labor trying to guess